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| Number | Title | Issue Date |
| 4868917 | Radar arrangements A radar apparatus transmits right circular polarized signals and selects the right circular polarized components of the corresponding returns. It also transmits left circular polarized signals and selects the left circular polarized components of the corr... | 09/19/1989 |
| 4811020 | Radar protected against rain clutter and method for protecting a radar against rain clutter The radar is designed to identify and then eliminate rain clutter signals. For this, the radar works in circular polarization with alternately identical and opposite polarization directions at transmission and reception, from one recurrence to the next on... | 03/07/1989 |
| 4742354 | Radar transceiver employing circularly polarized waveforms A radar transceiver is disclosed which operates with circularly polarized waveforms. A single circularly polarized antenna is used to transmit and receive circularly polarized waveforms. A 3-dB directional coupler splits the signal to be transmitted into ... | 05/03/1988 |
| 4737793 | Radio frequency antenna with controllably variable dual orthogonal polarization A controllable dual input/output port power divider coupled with a controllable phase shifter feed a dual ported dual polarized microstrip antenna structure. By controlling the power divider and phase shifter, arbitrary orthogonal polarization (e.g., line... | 04/12/1988 |
| 4691205 | Beam forming network for circularly polarized shaped beam antenna system A reduced size and weight beam forming network for a circularly polarized N element array antenna system is achieved by interconnecting quadrature couplers without intermediate phase shifters and adding twisted waveguide phase shifters at the coupler outp... | 09/01/1987 |
| 4630057 | Vehicle location system A leaky-feeder or other form of guided radiocommunication system serving a linear route or track is equipped at intervals with static marker devices which successively modify a radio signal passing those points between a fixed base station and a personal ... | 12/16/1986 |
| 4543579 | Circular polarization antenna A circular polarization antenna having wide-band circular polarization characteristics and impedance characteristics is accomplished by feedng N-antenna elements which are shifted at an interval of π/N rad. with respect to the boresight direction with di... | 09/24/1985 |
| 4494117 | Dual sense, circularly polarized helical antenna A helical antenna for radiating waves in both orthogonal states of circular olarization that is fed at the base by a first feed and at the tip by a second feed. The amplitude and phase of the signal from the first feed controls the amplitude and phase of t... | 01/15/1985 |
| 4443800 | Polarization control element for phased array antennas Each antenna of the phased array is supplied a lineal polarized wave which has been shifted in phase and rotated in polarization in accordance with a cascade connection of a NRCP, Faraday rotator and a RNRCP. The control windings of the Faraday rotator an... | 04/17/1984 |
| 4408206 | System for transmitting power from a solar satellite to earth and subsequent conversion to a 60 Hertz three phase signal Electrical power at microwave frequencies produced by solar cells or similar devices on satellite stations in space is phase modulated prior to its being beamed to earth. At the receiving station on earth, the power in the beamed signal is recovered at th... | 10/04/1983 |
| 4329687 | Radar radiating polarized signals The radar radiates, alternately or according to a given code, left-hand and right-hand circularly or elliptically polarized signals. At the receiving end, the two orthogonal polarized components of the received signal are processed separately, and the pha... | 05/11/1982 |
| 4292685 | Apparatus and method for controlling crosspolarization of signals in a frequency reuse system Apparatus and method for controlling the crosspolarization of signals in a satellite communications, frequency reuse system. Each earth station in the system includes one crosscoupling network that compensates for the crosspolarization of signals transmit... | 09/29/1981 |
| 4217549 | Device for two-way information link This invention relates to a device for a two-way information link, where a first one of two units or both units are intended to transmit an interrogation signal to the second unit, and the second unit is capable to transmit a response to the first unit.... | 08/12/1980 |
| 4156874 | Anti-collision vehicle radar system The anti-collision vehicle radar system overcomes interference problems due to radar beams from similar radar systems on other vehicles by providing a radar transmitter having a transmitting antenna which transmits a radar beam having circular polarizatio... | 05/29/1979 |
| 4119967 | Microwave dual mode non-interfering CW and pulsed signal system method and apparatus A microwave system is disclosed for simultaneous amplification and radiation of CW and pulsed signals wherein signals from a CW amplifier tube and a pulsed power amplifier tube are transmitted to an antenna where they are radiated as signals with circular... | 10/10/1978 |
| 4117488 | Multipurpose, multifunction antenna A dual circularly polarized radiating and receiving arrangement is coupled to a dual circular polarizer which has coupled thereto a transmit port and a receive port. A circuit arrangement is coupled to both of the ports to enable radiation of a selected o... | 09/26/1978 |
| 4106015 | Radar system with circular polarized transmission and adaptive rain depolarization compensation A radar system for transmitting pulsed circularly polarized wave, having two separate receiving channels corresponding to the two mutually orthogonal components of the received wave. Apparatus is included for detecting variations of phase between the two ... | 08/08/1978 |
| 4005414 | Method for providing means to eliminate ambiguous polarization effects on phase and amplitude of radar backscatter due to unknown target aspect angle A radar system is operated in a manner that provides determination of the coincidence of radar signal polarization with the major axis of a target of unknown aspect angle. This information so obtained can be utilized to enhance radar signals or to improve... | 01/25/1977 |
| 3997901 | Method of directing an aerial to a receiver according to a main direction An apparatus for directing an antenna has an information signal being emitted in a main direction from the antenna. Two auxiliary signals are transmitted symmetrically about the antenna, from which an error signal can be derived for alignment of the anten... | 12/14/1976 |
| 3956699 | Electromagnetic wave communication system with variable polarization An electromagnetic transmitting or receiving communications system with multiple polarization capability. In the transmit mode an input signal is divided between two signal processing channels which feed a dual mode radiation element for exciting orthogon... | 05/11/1976 |
